Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/1106#discussion_r17251647
--- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala
---
@@ -481,13 +481,23 @@ private[spark] class Master(
if (state != RecoveryState.ALIVE) { return }
// First schedule drivers, they take strict precedence over
applications
- val shuffledWorkers = Random.shuffle(workers) // Randomization helps
balance drivers
- for (worker <- shuffledWorkers if worker.state == WorkerState.ALIVE) {
- for (driver <- List(waitingDrivers: _*)) { // iterate over a copy of
waitingDrivers
- if (worker.memoryFree >= driver.desc.mem && worker.coresFree >=
driver.desc.cores) {
+ // Randomization helps balance drivers
+ val shuffledAliveWorkers = Random.shuffle(workers).toArray
+ val aliveWorkerNum = shuffledAliveWorkers.size
+ var curPos = aliveWorkerNum - 1
+ for (driver <- List(waitingDrivers: _*)) {
--- End diff --
There's now a little bit of logic in this code block. Can you comment that
this schedules driver on a round-robin fashion?
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